For P3 latency, the main effect of the number of standards preceding the target was also significant (χ2 (3; N = 275) = 12.71, p = .005). In general, when more standards preceded the target, latency was shorter (mean latencies were 448.8, 449.5, 445.1, and 445.9 ms, respectively, for the different conditions). However, this was not moderated by EXT (χ2 (3; N = 275) = 1.28, p = .734) nor was there a main effect of EXT (χ2 (1; N = 275) = 0.30, p = .584), in contrast to the findings for amplitude.
